Historical Versions of the United States Code Now Online, by Sabrina I. Pacifici, beSpacific Blog
The Library of Congress has bought over 60 years of the U.S. Code from Hein Online. The historical research you will find here has not been available for free online before this publication by the Library of Congress. Because of the depth of the research at this site, you should definitely take a look.
This link will take you directly to the website, which will also give you a complete description of the information you will find there: https://www.loc.gov/collections/united-states-code. I also suggest taking the time to check out this link for the United States Code prepared by the Office of the Law Revision Counsel of the United States House of Representatives: http://uscode.house.gov/browse.xhtml.
There will be times when you will find no case law to support a state or federal statute. To make a convincing argument to the court, you may need to rely upon the legislative intent – the reason why the legislature made the law. To do that, you will need to read committee reports and other information to fully understand the legislature’s rationalization for writing the law as it did. These websites should enhance your ability to perform that research for federal statutes. -CCE